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  <title>Document</title>
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  <script>
    // 声明一个函数
    function add(a,b){
      console.log(this)
      return a + b + this.c
    }
    // 声明一个全局对象
    let obj = {
      c:521
    }
    // 添加全局属性
    window.c = 1314;

    // 执行call函数
    console.log(apply(add,obj,[10,20]))
    console.log(apply(add,null,[10,20]))
    
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